Only run inside a Windows Sandbox or a disposable VM. Better yet, use legitimate offline launchers like MultiMC (with offline mode) instead of random “patched” builds.
If "unblocked" means bypassing school Wi-Fi restrictions to play with friends: 112 minecraft unblocked patched
If your school allows personal devices, connect your laptop to your phone’s hotspot instead of the school Wi-Fi. The school firewall cannot block what it cannot see. Be mindful of data caps—Minecraft uses ~100MB per hour of multiplayer. Only run inside a Windows Sandbox or a disposable VM